Redis 正则匹配 key值

redis help

redis-cli --help
redis-cli 4.0.9
 
Usage: redis-cli [OPTIONS] [cmd [arg [arg ...]]]
  -h <hostname>      Server hostname (default: 127.0.0.1).
  -p <port>          Server port (default: 6379).
  -s <socket>        Server socket (overrides hostname and port).
  -a <password>      Password to use when connecting to the server.
  -u <uri>           Server URI.
  -r <repeat>        Execute specified command N times.
  -i <interval>      When -r is used, waits <interval> seconds per command.
                     It is possible to specify sub-second times like -i 0.1.
  -n <db>            Database number.
  -x                 Read last argument from STDIN.
  -d <delimiter>     Multi-bulk delimiter in for raw formatting (default: \n).
  -c                 Enable cluster mode (follow -ASK and -MOVED redirections).
  --raw              Use raw formatting for replies (default when STDOUT is
                     not a tty).
  --no-raw           Force formatted output even when STDOUT is not a tty.
  --csv              Output in CSV format.
  --stat             Print rolling stats about server: mem, clients, ...
  --latency          Enter a special mode continuously sampling latency.
                     If you use this mode in an interactive session it runs
                     forever displaying real-time stats. Otherwise if --raw or
                     --csv is specified, or if you redirect the output to a non
                     TTY, it samples the latency for 1 second (you can use
                     -i to change the interval), then produces a single output
                     and exits.
  --latency-history  Like --latency but tracking latency changes over time.
                     Default time interval is 15 sec. Change it using -i.
  --latency-dist     Shows latency as a spectrum, requires xterm 256 colors.
                     Default time interval is 1 sec. Change it using -i.
  --lru-test <keys>  Simulate a cache workload with an 80-20 distribution.
  --slave            Simulate a slave showing commands received from the master.
  --rdb <filename>   Transfer an RDB dump from remote server to local file.
  --pipe             Transfer raw Redis protocol from stdin to server.
  --pipe-timeout <n> In --pipe mode, abort with error if after sending all data.
                     no reply is received within <n> seconds.
                     Default timeout: 30. Use 0 to wait forever.
  --bigkeys          Sample Redis keys looking for big keys.
  --hotkeys          Sample Redis keys looking for hot keys.
                     only works when maxmemory-policy is *lfu.
  --scan             List all keys using the SCAN command.
  --pattern <pat>    Useful with --scan to specify a SCAN pattern.
  --intrinsic-latency <sec> Run a test to measure intrinsic system latency.
                     The test will run for the specified amount of seconds.
  --eval <file>      Send an EVAL command using the Lua script at <file>.
  --ldb              Used with --eval enable the Redis Lua debugger.
  --ldb-sync-mode    Like --ldb but uses the synchronous Lua debugger, in
                     this mode the server is blocked and script changes are
                     are not rolled back from the server memory.
  --help             Output this help and exit.
  --version          Output version and exit.
 
Examples:
  cat /etc/passwd | redis-cli -x set mypasswd
  redis-cli get mypasswd
  redis-cli -r 100 lpush mylist x
  redis-cli -r 100 -i 1 info | grep used_memory_human:
  redis-cli --eval myscript.lua key1 key2 , arg1 arg2 arg3
  redis-cli --scan --pattern '*:12345*'
 
  (Note: when using --eval the comma separates KEYS[] from ARGV[] items)
 
When no command is given, redis-cli starts in interactive mode.
Type "help" in interactive mode for information on available commands
and settings.

keys help

http://doc.redisfans.com/key/keys.html

KEYS pattern
查找所有符合给定模式 pattern 的 key 。
KEYS * 匹配数据库中所有 key 。
KEYS h?llo 匹配 hello ， hallo 和 hxllo 等。
KEYS h*llo 匹配 hllo 和 heeeeello 等。
KEYS h[ae]llo 匹配 hello 和 hallo ，但不匹配 hillo 。
特殊符号用 \ 隔开
KEYS 的速度非常快，但在一个大的数据库中使用它仍然可能造成性能问题，如果你需要从一个数据集中查找特定的 key ，你最好还是用 Redis 的集合结构(set)来代替。
可用版本：>= 1.0.0时间复杂度：O(N)， N 为数据库中 key 的数量。返回值：符合给定模式的 key 列表。
redis> MSET one 1 two 2 three 3 four 4  # 一次设置 4 个 key
OK
 
redis> KEYS *o*
1) "four"
2) "two"
3) "one"
 
redis> KEYS t??
1) "two"
 
redis> KEYS t[w]*
1) "two"
 
redis> KEYS *  # 匹配数据库内所有 key
1) "four"
2) "three"
3) "two"
4) "one"

redis 统计某类key值的数量

• 统计所有的keys

    redis-cli -r keys * | wc -l

• 统计某类key值的数量,如 h*llo 匹配 hllo 和 heeeeello 等。

    redis-cli -r keys h*llo | wc -l

• 统计key值的数量正则写法

redis-cli --scan --pattern '*:12345*' | wc -l